Printing cylinder and plate.



M. A. DROITCOUR. PRINTING CYLINDER AND PLATE.

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PRINTING GYLINDBR AND PLATE.

APPLICATION IILLD JULY 17, 1909.

Patented May 31,1910.

UNITED sTAIps `PATENTI OFFICE.

MICHAEL A. DROITCOUR, OF CHICAGO, ILLINOIS, ASSIGNOR TO MIEHLE PRINTINGPRESS & MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, ACORPORATION 0FILLINOIS.

PRINTING CYLINDER AND PLATE.

Specication of Letters Patent.

Patented May 31, y1910.

To all 'whom it may concern:

Be it .known that I, MICHAEL A. DROIT- COUR, a citizen of the UnitedStates, residing .in Chicago, in the county of Cook and State ofIllinois, have invented a new and useful Improvement in PrintingCylinders and Plates, of which the following is a speci cation.

This invention relates to the construction of printing cylinders ofprinting presses and to the manner of securing the printing platesthereon.

The nature of my improvements is disclosed in the description givenbelow, and

Vthe improvements are also illustrated in the accompanying drawings inwhich- Figure 1 is a plan view of my improved cylinder; Fig. 2 is alongitudinal section thereof; Fig. 3 is a partial transverse section; Fig. 4 is a plan 'of the printing plate shown in Fig. 3. Figs. 5 and 6are sections on the lines 5-5 and 6 6 respectively of Fig. 3; Fig. 7 isa partial bottom view of one of the4 printing plate supporting blocks;Fig. 8 is a perspective of, oneof the bars used to secure the ends ofthe printing plates and Fig. 9 is a perspective of the rocking tighteneralso used in attaching the plates.

In said drawing 10 represents the vbody of the printing cylinder. It isprovided with interior ribs 11 and its surface is provided with annulargrooves 12 over each of Said ribs, one wall ofthe grooves being cutunder as seen at 13. The type lates which are shown at 14 are sup ortedrom the cylinders by blocks 15 'whic are of full height, and'by otherblocks 16 16a and 17 which are of less height and are placed one on theother, their united height being the same as that of the blocks 15. Ialso employ filler blocks 18 which also engage the annular grooves 12 ofthe cylinder. The blocks 16 16EL do not need to be the full length ofthe cylinder as is the case ofblocks 15, 17 and 18, but should be longenough to support the type plates 1/1 and they are secured to blocks 17as explained below.

To secure the supporting blocks to the cylinder I provide such of themas come in contact with the cylinder with depending hooks 19 adapted toengage the undercut wall 13 of the grooves 12, and in order that suchhooks may be formed into engagement in the grooves, I provide upon theends 0f the blocks a series of clamping screws 21v adapted to contactwith the head 20 of the cylinder and thereby impart longitudinalmovement to the blocks and force them away from the head 2O toward theopposite end of the cylinder. These screws are readily operated so as totighten any block desired or to release it. By means of these screws itwill be seen that the blocks upon which they bear will be renderedperfectly secure upon the cylinder so that neither the centrifugal forcecaused by the rotation of the cylinder or the suction exerted in theprinting operation will be able to force them outward from the cylinder.

In preparing the cylinder fory the application of printing plates Iarrange the supporting blocks in accordance with the nature of the workto be done. The full .height blocks 15 and 18 are placed so that theywill support the body of the plate, and two of the low blocks 17 arethen placed so they will come under the ends of the plate, and thenpreparatory to positioning the plates I secure the short blocks 16 and16 tothe blocks 17. This I have done by means of diagonal hooks 30 andscrews 29 having enlarged heads 29?. The blocks 16 162l are recessed toreceive such hooks and screws and the blocks 17 are provided withlongitudinal grooves 31 having one wall undercut, so that the hooks mayengage such wall. By turning the screws 29 the hooks will be tightenedin the groove by the resistance of the metal to the head 29a.

I illustrate in the detailed view Fig. 3 a printing plate which may beof any ordinary construction but it should be provided at the top andbottom edges with flexible margins 22 by means of which it may besecured upon the supporting blocks. These end margins are bent into theform shown in Fig. 3 preliminarly, so that when osiytioned and tightenedthe end portions o the by screws a entering the blocks 16 and theretainers 26 are provided with screws 27 entering the block 16*L andholding the retainer down to its work. In positioning the plate 14 themargin 22 at its forward end is first engaged under the retainer 25 anda filler 28 of any desired or needed thickness is placed under theinclined portion 23. -After thus securing the parts at the forward endof the plate I secure the rear end of the plate by engaging its upturnedlip 24 under the retainer 26 and force the screws of said retainerinward. In thus forcing the retainer 26 to its innermost position Icause a rocking of the tightener 32 which strains the plate and rendersthe same very taut.

The vfillers 28 are adapted to be varied not onl in thickness, but theymay be made of di erent thickness in different portions, that is to sayone end of the iller may be thicker than the other end. This causes askewing of the plate, which is often a great convenience in getting itinto register with other parts of the work being done, and it also actsto lockthe plate and to adjust it.

It will be noted that the blocks 15, 17 and 18 are all adjustable, andcan be placed anywhere upon the cylinder where they are required, andblocks 16 and 16a can be adjusted lengthwise of blocks 17 1. Theprinting cylinder, provided with undercut annular grooves, incombination with plate supporting blocks, and having depending hooksadapted to enter said grooves, some of said blocks being of full heightand others of partial heights, means for forcing said blocks lengthwiseto cause the engagement of the hooks in the grooves, short length blocksadapted to be placed on the partial height blocks, and means for lockingthe said short length and partial height blocks together.

2. The printing cylinder having undercut annular grooves, in combinationwith plate supporting blocks provided with means for engaging saidannular grooves, some of said blocks of partial height, means forforcing the blocks lengthwise to cause the locking engagement of saidmeans in the annular grooves, short length`block`s adapted to be placedon the said partial height blocks, and means for locking such shortlength and partial height blocks together.

3. The combination with the cylinder and plate supporting blocks securedto the cylinder, of plate retainers for the ends of the plates, saidretainers being secured to`the blocks and having overhanging hook edges,and a printing plate having mar ins with lips for engaging said hookedges and fillers 28 inserted under the margins to keep the lipsengaged.

4. In combination, a cylinder, blocks having hooks on their under sideadapted to engage corresponding recesses in the cylinder, and means forforcing the blocks endwise to lock the hooks in the recesses and securethe blocks in position; with short blocks, means for adjustablyattaching the short blocks to the other blocks, and plate retainingdevices attached to said short blocks.

5. In combination, a cylinder provided with annular undercut grooves,longitudinal blocks provided with hooks adapted to engage said grooves,and means for forcing the said blocks endwise to lock the hooks in thegrooves, some of said blocks being longitudinally grooved; with shortblocks adjustably attached to the longitudinally grooved blocks, andplate retaining devices on the short blocks.

6. In combination, a cylinder, a plurality of grooved blocks havinghooks on their under side adapted to engage corresponding recesses inthe cylinder, and means for forcing the blocks endwise so as to lock thehooks in the recesses and retain the blocks in position; with shortblocks provided with hooks adapted to engage the grooves in the groovedblocks to lock the short blocks thereto, and plate retaining devicesattached to said short blocks.

7. In combination, longitudinally grooved blocks, short blockssuperposed on the grooved blocks, adjustable hooks attached to saidshort blocks and engaging the grooves, and plate retaining devices onthe short blocks.

8. In combination, a supporting surface for printing plates, and a plateretainer having a hooked edge; with a printing plate having a marginprovided with a lip adapted to engage the hooked edge of the retainer,and a filler plate inserted under the margin of the printing plate tolock the hooked edge of the latter in engagement with the retainer.

9. In combination with a printing surface support having a beveled edge,and a plate retaining device adjacent said beveled edge; with a printingplate having a downwardly bent margin adapted to fit over the bevelededge of the supporting surface and having lips adapted to engage theplate retainer, and a filler plate inserted between the margin and thebeveled edge of the support to hold the lips in engagement with theretainer.

` 10. In combination, a supporting surface, and plate cretainers at theopposite sides of the printing surface, a printing plate superposed onsaid surface and having downwardly bent margins provided with lipsengaging the retainers, and filler plates inserted under the saidmargins to hold the lips in engagement with the retainers.

11. In combination, blocks having beveled edges, and plate retainers onthe blocks adjacent the beveled sides; with a printing plate having bentmargins overlying the beveled sides of the blocks and enga ing theretainers, and ller plates inserte between said margins of the plate andthe beveled portions of the blocks.

12. In combination, a cylinder, theplate supporting blocks thereon, ableshort blocks having' beveled sides, and plate retainers adjacent thebeveled sides of said blocks; with a printing plate having downwardlybent margins overlying the beveled sides of the short blocks andprovided with lips -engaging the retainers, and filler plates insertedbetween the said margins of t e bloc s. y A

13. In combination a printing press cylinder having a plurality of'undercut annular grooves 1n its periphery with detachable4 platesupporting blocks having `depending hooks adapted to' enter saidgrooves, and means for forcing the blocks endwise to cause the lockingengagement of the. hooks in the grooves. i

14. In combination a printing press cylinder provided with a pluralityof undercut annular grooves in its periphery, in combi- V nation withdetachable plate supporting provided with lips laterally adjustgroovesin the late and the said beveled sides of the.

blocks of various widths each having hooks adapted to enter saidgrooves, and means for forcing said blocks endwise so as to cause .thelocking engagement of the hooks in the grooves.

l5. In combination, a cylinder having flanged ends and intermediateannular undercut grooves, with a block having hooks on its under sideadapted. to engage the cylinder, 'and means engaging the end of theblock and the adjacent flange on cylinder for forcing the block end-Wise to lock the hooks in the recesses and thereby retain the block inposition. 16. In combination, a lprinting press cylinder having aflanged end and a plurality of annular grooves, a plurality 'of blockshaving hooks on their under side adapted to engage the grooves in thecylinder, and bolts in the ends of the blocks engaging the cylinderiange for forcing the blocks endwise so as to lock the hooks in thegrooves and thereby secure the blocks in position.

MICHAEL A. DROITCOUR. Witnesses: y

H. M. MUNDAY, E. ABRAMS.

